RTX 2070 Super not recognized by Blender 2.82a (Debian Linux)
Edit:
Downloading 2.83.1 directly from the Blender website (not Pop!_Shop) fixed it for me.

Not an answer, but I have a similar problem.  My 2070 Super is not recognized for CUDA rendering in Blender 2.83.  I downloaded 2.82a and it works fine.  This is odd.
I use Pop!_OS 20.04 as well.